See, my thought is that I'm happy I can only get to Lvl 12 now, because a single round is quicker, and I can get on to the next round. I remember getting to level 15 and above earlier, but the gauntlet seemed to drag on and on, so I don't mind the steeper growth curve. Does it really hurt people's feelings that only the best can get to lvl 15? It means nothing if you get the same rewards and rank increase in 12 levels as you used to get in 15 or more levels, at least in comparison to other players. Quicker gauntlet runs doesn't bug me any.
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